These small ridges are composed of mostly fresh, ignimbrite cobbles and reveal little pedogenic development. From Wordnik.com. [Quelccaya Plant Deposits Again « Climate Audit] Reference
Past eruptions from the Taupo cauldera and other northern volcanic centers formed a number of large upland ignimbrite plateaus. From Wordnik.com. [Northland temperate forests] Reference
In parts of China, houses were built of bricks carved from ignimbrite quarries, but in northern Italy the opposite approach had been taken, with homes and shops being excavated within tuff deposits. From Wordnik.com. [Asimov's Science Fiction]
A little info for your brain: The Cappadocia region is largely underlain by sedimentary rocks formed in lakes and streams, and ignimbrite deposits erupted from ancient volcanoes approximately 9 to 3 million years ago late Miocene to Pliocene epochs. From Wordnik.com. [My travels by train, taxi, bus, marshutka/dolmush, boat, plane and foot.] Reference
Some of the calderas erupting the large-volume ash-flow tuffs of Nevada are truly huge, as can be seen in the last link and in this one, where the debatable subject is whether the ignimbrite flare-up had anything to do with regional extreme extension in Nevada. From Wordnik.com. [Geology on the Road: Highway 50 #2] Reference
It would fall into the 17 to 34 m.y. old category of central Nevada ash-flow tuffs (part of the Mid-Tertiary ignimbrite flare-up), and is probably in the 22 to 25 m.y. old range (that's my guess based on work in the region quite a while ago - the rocks haven't aged too much since then). From Wordnik.com. [Geology on the Road: Highway 50 #1] Reference
The north-west trending breccia vein crops out for about 200 meters and is developed at the faulted contact between andesite and ignimbrite. From Wordnik.com. Reference
The inner 7. 5-kilometer-wide caldera, which was formed during emplacement of the Bali (or Ubud) ignimbrite, has been dated at about 23670 and 28500 years ago. From Wordnik.com. [WN.com - Photown News] Reference
40Ar/39Ar dating that an ignimbrite overlying the artefact layers at Wolo Sege was erupted 1.02. From Wordnik.com. [Naturejobs - All Jobs] Reference
56,000 year old Green Tuff ignimbrite. From Wordnik.com. [ScienceBlogs Channel : Life Science] Reference
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